Experiences using the constraint technique on bottom trawl doors
Original version
This report is not to be cited without prior reference to the authorsAbstract
The constraint technique, i.e. using a rope between the warps, has the intention of minimizing
the variability in trawl geometry with depth. Experiments with the constraint technique on two
different bottom trawls used in the Norwegian surveys are reported and discussed. In addition,
modifications of trawling technique, which enable the trawl doors to maintain constant ground
contact under different conditions, are presented.